Effect of Nesting Cover Density on American Crow Predation of Simulated Duck Nests

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Abstract
Predation by American crows (Corvus brachyrhynchos) on simulated duck nests was studied in Saskatchewan parklands during 1985. Survival of nests (> 80% hidden) after nearby exposed "decoy" nests had been found was followed in cover of different heights and densities. Short cover was grass-dominant, whereas tallest and densest cover was shrub-dominant, particularly snowberry (Symphoricarpos spp.). Survival increased with cover height and density and reached maximum at about 70 cm height. It is postulated that tall, dense cover represents a behavioral deterrent as well as a physical barrier to crows hunting on foot. Our reuslts indicated that the protection and enhancement of shrub cover would be a beneficial technique for increasing nesting success of certain duck species where crow predation is severe.

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